java 导出Excel文档工具类

import java.util.List;
import java.util.Map;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;

/**
* 导出Excel文档工具类
* @author admin
* @date 2014-11-22
* */
public class ExcelUtil
{

/**
* 创建excel文档，
* @param list 数据
* @param keys list中map的key数组集合
* @param columnNames excel的列名
* */
public static Workbook createWorkBook(List<Map<String, Object>> list, String[] keys,
String columnNames[],String model)
{
// 创建excel工作簿
Workbook wb = new HSSFWorkbook();
// 创建第一个sheet（页），并命名
//        Sheet sheet = wb.createSheet(list.get(0).get("sheetName").toString());
//Sheet sheet = wb.createSheet("预约看房导出");
Sheet sheet = wb.createSheet(model);
// 手动设置列宽。第一个参数表示要为第几列设；，第二个参数表示列的宽度，n为列高的像素数。
for (int i = 0; i < keys.length; i++ )
{
sheet.setColumnWidth((short)i, (short)(35.7 * 150));
}

// 创建第一行
Row row = sheet.createRow((short)0);

// 创建两种单元格格式
CellStyle cs = wb.createCellStyle();
CellStyle cs2 = wb.createCellStyle();

// 创建两种字体
Font f = wb.createFont();
Font f2 = wb.createFont();

// 创建第一种字体样式（用于列名）
f.setFontHeightInPoints((short)10);
f.setColor(IndexedColors.BLACK.getIndex());
f.setBoldweight(Font.BOLDWEIGHT_BOLD);

// 创建第二种字体样式（用于值）
f2.setFontHeightInPoints((short)10);
f2.setColor(IndexedColors.BLACK.getIndex());

//      Font f3=wb.createFont();
//      f3.setFontHeightInPoints((short) 10);
//      f3.setColor(IndexedColors.RED.getIndex());

// 设置第一种单元格的样式（用于列名）
cs.setFont(f);
cs.setBorderLeft(CellStyle.BORDER_THIN);
cs.setBorderRight(CellStyle.BORDER_THIN);
cs.setBorderTop(CellStyle.BORDER_THIN);
cs.setBorderBottom(CellStyle.BORDER_THIN);
cs.setAlignment(CellStyle.ALIGN_CENTER);

// 设置第二种单元格的样式（用于值）
cs2.setFont(f2);
cs2.setBorderLeft(CellStyle.BORDER_THIN);
cs2.setBorderRight(CellStyle.BORDER_THIN);
cs2.setBorderTop(CellStyle.BORDER_THIN);
cs2.setBorderBottom(CellStyle.BORDER_THIN);
cs2.setAlignment(CellStyle.ALIGN_CENTER);
//设置列名
for (int i = 0; i < columnNames.length; i++ )
{
Cell cell = row.createCell(i);
cell.setCellValue(columnNames[i]);
cell.setCellStyle(cs);
}
//设置每行每列的值
for (short i = 1; i < list.size(); i++ )
{
// Row 行,Cell 方格 , Row 和 Cell 都是从0开始计数的
// 创建一行，在页sheet上
Row row1 = sheet.createRow((short)i);
// 在row行上创建一个方格
for (short j = 0; j < keys.length; j++ )
{
Cell cell = row1.createCell(j);
cell.setCellValue(list.get(i).get(keys[j]) == null ? " " : list.get(i).get(keys[j]).toString());
cell.setCellStyle(cs2);
}
}
return wb;
}

}

Map<String, Object> retMap = new HashMap<String, Object>();
String orderCode = ServletRequestUtils.getStringParameter(request, "order_code", "");

List<Map<String, Object>> retList = hotelOrderService.queryExportInfo(orderCode);
//时间转换
for (Map<String, Object> it : retList)
{
String inDate = String.valueOf(new SimpleDateFormat(DateUtil.DATE_STYLE_SIMPLE).format(it.get("in_date")));
it.put("in_date", inDate);

String outDate = String.valueOf(new SimpleDateFormat(DateUtil.DATE_STYLE_SIMPLE).format(it.get("out_date")));
it.put("out_date", outDate);

Object obj = it.get("pay_time");

if(obj != null)
{
String payTime = String.valueOf(new SimpleDateFormat(DateUtil.DATE_STYLE_BASIC).format(obj));
it.put("pay_time", payTime);
}

String createTime = String.valueOf(new SimpleDateFormat(DateUtil.DATE_STYLE_BASIC).format(it.get("create_time")));
it.put("create_time", createTime);

Object updateObj = it.get("update_time");
if(updateObj != null)
{
String updateTime = String.valueOf(new SimpleDateFormat(DateUtil.DATE_STYLE_BASIC).format(updateObj));
it.put("update_time", updateTime);
}
}

if (retList.size() > 0)
{
BufferedInputStream bis = null;
BufferedOutputStream bos = null;

try
{
//文件名
 String fileName = "预订" + DateUtil.currentDate(DateUtil.DATE_STYLE_SIMPLE);
//excel表头
String columnNames[] = {"订单编号", "联系人姓名", "联系人电话", "所选房型", "所定间数", "入住时间", "离店时间",
"最迟几点前到达", "特殊要求", "支付方式", "订单状态", "价格", "门市价格", "订单总价", "支付时间", "订单创建时间",
"订单更新时间"};
//对应字段
String keys[] = {"order_code", "name", "tel", "room_name", "nums", "in_date",
"out_date", "come_date", "special_cmd", "pay_type", "order_state",
"room_price", "retail_price", "total_price", "pay_time", "create_time",
"update_time"};

ByteArrayOutputStream os = new ByteArrayOutputStream();

ExcelUtil.createWorkBook(retList, keys, columnNames, "预订导出").write(os);

byte[] content = os.toByteArray();
InputStream is = new ByteArrayInputStream(content);
// 设置response参数，可以打开下载页面
response.reset();
response.setContentType("application/vnd.ms-excel;charset=utf-8");
response.setHeader("Content-Disposition",
"attachment;filename="
+ new String((fileName + ".xls").getBytes(), "iso-8859-1"));
ServletOutputStream out = response.getOutputStream();

bis = new BufferedInputStream(is);
bos = new BufferedOutputStream(out);

byte[] buff = new byte[2048];
int bytesRead;

while (-1 != (bytesRead = bis.read(buff, 0, buff.length)))
{
bos.write(buff, 0, bytesRead);
}

retMap.put("msg", "预订数据导出成功！");
return retMap;
}
catch (UnsupportedEncodingException e)
{
log.error(e.toString() + " : " + e.getMessage());
//插入异常日志
insertErrorLog(request, MODULE,
"export UnsupportedEncodingException#" + e.toString());

retMap.put("msg", "预订数据导出失败！");
return retMap;
}
catch (IOException e)
{
log.error(e.toString() + " : " + e.getMessage());
//插入异常日志
insertErrorLog(request, MODULE, "export IOException#" + e.toString());

}
finally
{
try
{
if (bis != null)
{
// bis.close();
}

if (bos != null)
{
bos.flush();
//bos.close();
}

}
catch (IOException e)
{
log.error(e.toString() + " : " + e.getMessage());
//插入异常日志
insertErrorLog(request, MODULE, "export IOException#" + e.toString());

retMap.put("msg", "预订数据导出失败！");
return retMap;
}
}
}
else
{
retMap.put("msg", "无对应的数据可以导出！");
retMap.put("size", "isNull");
}

return retMap;
}